no a 400w led will not match a 1000w hps. ive seen test comparisons where a 360w led went up against a 400w hps. and the yields were very close to the same. there are pluses and minuses to both light sources. i ran a 350w led unit for a yr and a half and had to suppliment it with 4 105w cfls. i am now running 2 400w cmh bulbs in the same area with better results.